Where did you got those 9 from?
I tried to understand how Haki works, i figured out what Three Types of Haki mean
Then i applied what i learned to discover Nine Advanced Techniques (Meaning each Type of Haki have Three Advanced Uses)
With Third Advanced Technique of each Type been Most Rare & cannot be achieved by Training alone
After that, i thought what if each Application of these Techniques was Infinite
And i noticed that it does work, and lead me to existence of Nine Unique Powers
In other words:
There is Something in One Piece that is Effected by Hardening Permanently
There is Something in One Piece that is Constantly using Future Sight Infinitely
There is Something in One Piece that is Permanently covered in Barrier Haki
There is Something in One Piece that is Permanently listening with Voice of All Things
There is Something in One Piece that unleashes Internal Destruction that never Fades
... etc
I discovered what these Nine Powers/Treasures are & i discovered that There is only One Owner to each in entire World.
And the ones Created from Third Adv. Technique of each Haki Type ended up being Ancient Weapons
In other words, Poseidon is Power Created from Infinite Voice of All Things which is believe is Observation Haki Level 3
And Pluton is Power Created from Infinite Internal Destruction which is Armament Haki Level 3
And Uranus is Power Created from Haoshoku Haki Level 3 which isn't Revealed yet
Then i noticed that those Nine Characters are actually related to Nine Straw Hats in more ways than one
As not only their Backstories are Related (Two Faces of Same Coin), but their Dreams are related as well & SHs represent a Mini-Version of them when it comes to those Unique Powers They wield
After that, when i added Straw Hats to the Pattern i noticed that They were Ranked in a Very Unique way, which revealed that their Origin & Backstories are actually Re-Creation of Ancient Figures who first Unlocked those Unique Powers
Then i noticed how each one of those Ancient Figures are actually related to a Specific Kingdom & this Pattern tbh keeps on giving, with each Discovery proving it's legitimacy
So Overall, Oda created a System of One (Haki) ---> Three (CoO - CoA - CoC) ---> Nine (Advanced Techniques)
That explains the entire World, Power System, Story & Lore
Nine Powers
Nine Treasures
Nine Roles
Nine Key Characters
Nine Ancient Legends
Nine Straw Hat Pirates
Nine Kingdoms
Nine Dreams
Nine Backstories
Nine Seas
... etc
And this Pattern can be applied to anything & everything in One Piece, it's like Blueprint of Oda's Work.
The Story is much bigger than People realize, the Fact that Luffy is accompanied by Nine People, means there are Nine Stories that are Connected, it's not like each SH is having their own Manga, this is a Single Story.
Pluton was mentioned in Arabasta Arc for example, We had an entire Saga of a Villain wanting this Weapon, and then again Water 7 Saga was also about seeking this Weapon, and Pre-TS Ended without a Second Weapon ever been mentioned, yet it was revealed that Pluton is actually One of Three around Chapter 650
Same thing for Ancient Kingdom, and then Hundreds of Chapters later, WB mentioned a Land of Gods that existed before Mary Geoise, meaning it Predates Void Century (Cuz Mary Geoise existed before WG was Formed)
And look how it was Confirmed that Joy Boy & Nika are not the same Characters, Nika is from Elbaf, Joy Boy is from Ancient Kingdom, something that i kept insisting on when Gear 5 was Revealed, but everyone thought it was Crazy thing to say
Oda is only revealing what the People of OPVerse think & believe, which is the Equivalent of only looking through a Keyhole, Fans need to stop focusing on what Little Information We are given & start to see the Bigger Picture